abox_edge: Add wired headset support in 88pm88x-headset.

Add switch classs hook in 88pm88x-headset driver so that the headset
information can be read from /sys/class/switch/h2w/.

BUG=26071627

Change-Id: Iec7626bfb9cb0a617a38591cd3508366bd1fabc8
1 file changed